I am very new to DFS and have only been playing since the beginning on the NFL season. I have acquired about $450 in my bank roll by just doing GPP on Fan Duel. I wanted suggestions on how which contests I should play and what strategy I should use to increase my bank roll. I feel like since I have a decent amount of cash, I can use it to benefit me by being safe but also making some gain.

It depends on what you're comfortable with honestly. If you want to play it safe do cash games and try to slowly build it up. If you want larger paydays do gpps. Nothing is guaranteed and you can lose it all. Maybe do 30 bucks a week with the 450 you have now and if you win more then take it as a bonus.

If you're asking how to make thousands it's basically put it in a gpp every week, do your research and hope to get lucky. Or do h2h with confident lineups. Remember it's about having fun. If you don't have the stomach to lose 450 then stop playing now while you're ahead